Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Christopher Joseph Markus, D.O

Emergency Medicine Physician in Roseville, CA · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1891717427

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Registry record

Entity type Individual (Type 1)

Name Christopher Joseph Markus

Credential D.O

Sex Male

Practice address 1 Medical Plaza Dr, Roseville, CA, 95661

Phone (916) 781-1000

Enumeration date Jul 24, 2006

Last updated in NPPES Oct 26, 2007

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 20A7300 (CA) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
00AX73000	Medicaid	CA	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1891717427 active?

Yes, as of the latest NPPES snapshot, NPI 1891717427 is active (record last updated 2007-10-26).

How do I verify Christopher Markus's NPI record?

Cross-check NPI 1891717427 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-10-26.